Process of treating creosote-oil.



' substantially creosote oil,

- creosote oil produced "strong creosote or creosote or tarry o THOMAS W. PRITCHARD, OF WILMINGTON; NORTH CAROLINA, ASSIGNOR TO NATIONAL WOOD DISTILLING COMPANY, OF WILMINGTON, NOB-TH CAROLINA,

OF NORTH. CAROLINA..

rnocnss or 'rnEA'r A CORPORATION mo CItEOSOTE-OIL.

No Drawing. Application filed August 14, 1911, Serial No. 643,909. Renewed October 26,

To all whom it may concern:

Be it known that I, THOMAS WV. PRrrcH- ARD, a citizen of the United States, residing at Wilmington, in the county of New Hanover, State of North Carolina, have invented certain new and Processes of Treating Creosote-Oil, of which the following isa description.

My invention relates to the treatment of creosote oil produced by the destructive distillation of resinous wood, and consists in the herein described'process of producing from such creosote oil an oil having the characteristicsof rosin oil, and in the oil so produced.

In carrying out the process of my invention I take ordinary commercial heavy wood by destructive distillation of pine or other resinous wood, which is characterized by a dark brown color and tarry odor, and first sub- "ect it. to a heat not substantially in excess any desiredform, provided only that it is heated evenly throughout, and it can be brought to and maintained as long as necessary at the degree of heat desired. I prefer to use a still heated by circulation of February 25, 1908, No. 880,466. By heating the still to not substantially exceeding 500 degrees F. and maintaining the heat for a short time a light oil is driven ofi, having the same odor as the heavy but light brown in color and ver fluid. This I term light creosote oil. After this light creosote oil has been completely driven ofi by continuing the heat at about 500 degrees until vaporization ceases, I increase the heat. At about 550 degrees F. a heavy oil begins to distil off. This heavy oil is a clear viscid oil, Wholly free from dor and practically free from any odor whatever, though having a slight phenol odor, and has the general characteristics of a high grade rosin oil, but having a less content of rosinacids and Specification of Letters Patent.

a higher content of oxidized --.acids.

raised to 650 degrees.

useful Improvements in employed.

heating up to be "distilled off at a comparativel a fluld, .as described in the U. S. patent issued tome Patented May 30, 1916. 1915. Serial No.

lower iodin value than rosin oil and having The heat may be gradually F., or even 700 degrees .F., and the heavy oil continues to distil over the oil distilled at temperatures above 550 degrees F., being lighter in color than that distilled at 550 F., being about the same as regards viscidity andfreedom from odor, Whatever the heat, between 550 degrees F. and 700 degrees F., 'I prefer not to carry the heat above 700 degrees F., as a higher heat might cause the residue in the still to-crack and be broken up into substances which might not be useful or desirable. been maintained at the highest heat found desirable until the heavy oil ceases to'be distilled ofi, it is cooled, and the residue consisting of pitch-like material is removed and mixed with the light creosote oil first disclosely resembling of 500'degreesF. in a still, which may be of the still.

1 It will of course be understood that in the still at the beginning of the operation that light creosote oil will begin y low temperature, and if desired the oil distilled at different temperatures may be kept separate. So also in distilling off the heavy oil at 550 degrees F. and higher, the oil distilled at difierent temperatures may be kept separate.

It will of course be understood that the temperatures herein given are approximate only, and may be varied somewhat without departing from the spirit of the invention;

, Having thus described my invention, what I claim and desire to secure by Letters Patent is: i

1. The process of treating Wood creosote oilproduced from resinouswo and having the characteristic creosote odor, to produce an oil free from creosote odor, which consists in heating the creosote oil to a temperature not exceeding 500 degrees F and maintaining it at such temperature until all After the still has substances having creosote odor have been distilled ofi and then raising the temperature to not exceeding 700 degrees F. and distilling off oil free from creosote odor.

2. The herein described oil produced from creosote oil by the herein described'process having the general characteristics of rosin Ollblli? havmg a less content ofrosin acids 

